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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

3.3, and 10.5
1.1, and 12.1
6.5, and 8.0
2.2, and 9.4

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Structure and Properties of Amino Acids
Molecules that bear charged groups of opposite polarity are known as

amphions
zwitterions
ion conversion
ambions

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Structure and Properties of Amino Acids
Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?

Lysine, arginine and histidine
Phenylalanine, valine, and aspartate
Leucine, threonine, and lysine
Isoleucine, valine and phenylalanine

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Structure and Properties of Amino Acids
Which of the following is not a sensible grouping of amino acids based on their polarity properties?

Phe, Trp, and Tyr
Asp, Ile, and Pro
Ala, Leu, and Val
Arg, His, and Lys

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Structure and Properties of Amino Acids
In a polypeptide average mass of an amino acid residue is

110 daltons
118 daltons
80 daltons
150 daltons

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Structure and Properties of Amino Acids
Which of the following is not the hydrophobic and aromatic amino acid?

Tryptophan
None of these
Phenylalanine
Tyrosine

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